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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 513 · 40 questions
TalentJR

The trick (Count the places): Forget the points and multiply the whole numbers. Count all the digits after the points in the question. Put the point that many places from the right, then check by rounding.

NameDateTime takenScore ___ / 40
  1. 1.0.83 × 0.7 — where does the decimal point go? (a) 5.81 (b) 0.00581 (c) 0.581 (d) 0.0581
  2. 2.2.1 × 9 — where does the decimal point go? (a) 18.9 (b) 0.189 (c) 189 (d) 1.89
  3. 3.8.4 × 3.9 — where does the decimal point go? (a) 32.76 (b) 0.3276 (c) 327.6 (d) 3.276
  4. 4.0.96 × 0.6 — where does the decimal point go? (a) 0.576 (b) 5.76 (c) 0.0576 (d) 0.00576
  5. 5.0.57 × 23 — where does the decimal point go? (a) 0.1311 (b) 13.11 (c) 131.1 (d) 1.311
  6. 6.0.97 × 28 — where does the decimal point go? (a) 0.2716 (b) 27.16 (c) 271.6 (d) 2.716
  7. 7.3.6 × 41 — where does the decimal point go? (a) 147.6 (b) 1476 (c) 1.476 (d) 14.76
  8. 8.8.8 × 8 — where does the decimal point go? (a) 704 (b) 7.04 (c) 0.704 (d) 70.4
  9. 9.0.23 × 0.6 — where does the decimal point go? (a) 0.00138 (b) 0.0138 (c) 1.38 (d) 0.138
  10. 10.2.7 × 28 — where does the decimal point go? (a) 7.56 (b) 756 (c) 75.6 (d) 0.756
  11. 11.1.2 × 43 — where does the decimal point go? (a) 51.6 (b) 5.16 (c) 0.516 (d) 516
  12. 12.0.43 × 0.8 — where does the decimal point go? (a) 0.344 (b) 0.0344 (c) 0.00344 (d) 3.44
  13. 13.8.5 × 2.5 — where does the decimal point go? (a) 0.2125 (b) 2.125 (c) 212.5 (d) 21.25
  14. 14.1.8 × 26 — where does the decimal point go? (a) 468 (b) 46.8 (c) 4.68 (d) 0.468
  15. 15.7.9 × 9 — where does the decimal point go? (a) 0.711 (b) 71.1 (c) 7.11 (d) 711
  16. 16.0.27 × 0.7 — where does the decimal point go? (a) 0.189 (b) 0.0189 (c) 0.00189 (d) 1.89
  17. 17.0.56 × 0.2 — where does the decimal point go? (a) 1.12 (b) 0.0112 (c) 0.112 (d) 0.00112
  18. 18.0.18 × 0.8 — where does the decimal point go? (a) 0.0144 (b) 0.144 (c) 1.44 (d) 0.00144
  19. 19.0.37 × 2 — where does the decimal point go? (a) 7.4 (b) 0.074 (c) 0.74 (d) 0.0074
  20. 20.6.1 × 8 — where does the decimal point go? (a) 4.88 (b) 0.488 (c) 488 (d) 48.8
  21. 21.5.1 × 3 — where does the decimal point go? (a) 0.153 (b) 15.3 (c) 1.53 (d) 153
  22. 22.2.1 × 1.4 — where does the decimal point go? (a) 0.0294 (b) 29.4 (c) 2.94 (d) 0.294
  23. 23.0.56 × 0.6 — where does the decimal point go? (a) 0.00336 (b) 3.36 (c) 0.336 (d) 0.0336
  24. 24.8.9 × 5 — where does the decimal point go? (a) 4.45 (b) 0.445 (c) 44.5 (d) 445
  25. 25.0.14 × 3 — where does the decimal point go? (a) 0.042 (b) 0.0042 (c) 4.2 (d) 0.42
  26. 26.4.6 × 0.2 — where does the decimal point go? (a) 9.2 (b) 0.92 (c) 0.092 (d) 0.0092
  27. 27.0.93 × 47 — where does the decimal point go? (a) 43.71 (b) 0.4371 (c) 4.371 (d) 437.1
  28. 28.0.74 × 24 — where does the decimal point go? (a) 177.6 (b) 17.76 (c) 0.1776 (d) 1.776
  29. 29.8.9 × 19 — where does the decimal point go? (a) 1691 (b) 169.1 (c) 1.691 (d) 16.91
  30. 30.0.29 × 7 — where does the decimal point go? (a) 2.03 (b) 0.203 (c) 20.3 (d) 0.0203
  31. 31.9.2 × 8 — where does the decimal point go? (a) 736 (b) 73.6 (c) 7.36 (d) 0.736
  32. 32.1.9 × 24 — where does the decimal point go? (a) 0.456 (b) 4.56 (c) 456 (d) 45.6
  33. 33.4.3 × 36 — where does the decimal point go? (a) 15.48 (b) 1548 (c) 154.8 (d) 1.548
  34. 34.1.2 × 0.4 — where does the decimal point go? (a) 0.048 (b) 4.8 (c) 0.48 (d) 0.0048
  35. 35.2.7 × 1.1 — where does the decimal point go? (a) 0.0297 (b) 0.297 (c) 29.7 (d) 2.97
  36. 36.9.1 × 44 — where does the decimal point go? (a) 4.004 (b) 4004 (c) 40.04 (d) 400.4
  37. 37.0.13 × 7 — where does the decimal point go? (a) 0.091 (b) 0.91 (c) 0.0091 (d) 9.1
  38. 38.9.9 × 0.5 — where does the decimal point go? (a) 0.0495 (b) 4.95 (c) 0.495 (d) 49.5
  39. 39.0.41 × 1.8 — where does the decimal point go? (a) 0.738 (b) 0.0738 (c) 0.00738 (d) 7.38
  40. 40.6.5 × 0.7 — where does the decimal point go? (a) 4.55 (b) 0.0455 (c) 0.455 (d) 45.5

Answer key

  1. 0.581
  2. 18.9
  3. 32.76
  4. 0.576
  5. 13.11
  6. 27.16
  7. 147.6
  8. 70.4
  9. 0.138
  10. 75.6
  11. 51.6
  12. 0.344
  13. 21.25
  14. 46.8
  15. 71.1
  16. 0.189
  17. 0.112
  18. 0.144
  19. 0.74
  20. 48.8
  21. 15.3
  22. 2.94
  23. 0.336
  24. 44.5
  25. 0.42
  26. 0.92
  27. 43.71
  28. 17.76
  29. 169.1
  30. 2.03
  31. 73.6
  32. 45.6
  33. 154.8
  34. 0.48
  35. 2.97
  36. 400.4
  37. 0.91
  38. 4.95
  39. 0.738
  40. 4.55

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